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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee6782ee38ae065fefbb2b06044e6cfbbff0603d6676ebcc9e9cd3be71aed3cb' 
  AND token = 'KvU50qaVDwY9n2e61wn2Yq9kIcECQ9sCQWT1tCrA7Kw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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