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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cac14756523131ec1cc78b3bf43a5db1470f6801ec54d0a97b20e01ae6608e66' 
  AND token = 'E6RUqaGSl3dA2G2/exDqTSIpn9Y9yeLSPRQhX9DBtqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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