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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e16ade1072e7dc336c890e807485d2e7cf9b64c156ed35245b50b1a750945677' 
  AND token = 'lm8QXLrJVcczRUg4LnWX4f6cLm1Ry0m8KdMFl3fDJcg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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