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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9920b961c8aa015da340ab677424e50710c7a63295880d5bc13edf1f945d8e2' 
  AND token = 'jjlHzk1IANBP8BLPmk9mlSuS/g8Px6CSF7qmaIHHcTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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