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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52801f057039e5fd1c5964f65651093e0a4738d0a8732486e5595ccecbf09d76' 
  AND token = 'e/+h14aw6bRwSYgkjIfbsgl3furw19nI0ORkp+wioeU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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