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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb8f17078d153831fa3f440e5c9702711ab6668b2531c520ac2015d36810814b' 
  AND token = 'Y8AaaayN+Qko2spKkqXA/wkmSu0LwrhgyC35X/ET1p8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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