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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '560c03d95817bafbfa27d8cd3109caf03bca38560bd1cb2bd697843f7077417d' 
  AND token = 'hxZlsnDHQE1+aEBQ7heg9JkQ8UyzBcg20yl/C3gR+XQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}