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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed9f8297bc370a16db425a2b6c8275512b5f3e268eb7cb50d3d073ce82e4fed8' 
  AND token = '5IbUNe3Csmjf4Cz2Tiy1WUx445lvWsBQf+VpdvBOiOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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