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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1109f589979adee99c260f53145266ee24c31e1948dd306eae66cfe041fc4035' 
  AND token = '2y7XyFWQjpPChCsqleiX476a66Xy48u3tQ1lx4o8Bco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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