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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e0940101f084e194c7c9324a9c57213ea9e4c10fcfc0eb3a248fc0bed634de1' 
  AND token = '1EBh8Uci4sV2pkMynpRGXq71wJAkODag9Whv1NmU1N4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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