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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7cae9587d6e845690bdff769bda050700a330e423842c61d2dd4aba38fb3be3' 
  AND token = 'ftkGheg3RBX/0387Pqt4oi96YbC3taMk603ApkqYWiY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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