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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edf9c80d9149c6654a90123aa02cdce0fcab8cb1c4598e312e53481b5a0a549e' 
  AND token = 'L7c31EnX3IXW6XIZ8QGwDCniTASvFXWfl7VrG96gJt0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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