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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce14bfbc7d0dd98632f9ff9034f44f39ca5587de148b8791a54b7f85bc8bda6d' 
  AND token = 'kBNM+gUxpb7KA1r37p4EJOKf9g9IUmFHF6Sv2992Z54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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