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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf7c264d532bd3083b75e2870de04c9f66a365ab5f13dd41760a27159c4c9b0c' 
  AND token = 'gsPZG6hgSHcmgrcQLyEgunA1bsV++cxohw1blui4LmY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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