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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e87cb3a4cc906f636fbab3150874c0f56dbc00235055addc4f38f37a5fcc63b5' 
  AND token = 'EeYVIjcSGn7El+IUF7Z5M8nUD24O9UeYxvxf/85ykLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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