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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0657cf16db58be7bdf76a368c350add189092e86e9afeec1de6c1f1be1fbaf5b' 
  AND token = '5CuzVv1Q9QaH4l10dsUGkG1hxTfYcya34me9C6Ht+2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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