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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd033418497e3b6798161dcc0b73ef7d4280560b5ceca10ebdb2355eafa5c4cab' 
  AND token = 'Ro+NIm4iMtG/jutRelVUB0Tmx/WzQT6oXUq3JK3r6Lo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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