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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eacd4f14c005f6c30cf4f507bf0c36961508f7696946d24f5aa307237248c0d5' 
  AND token = 'RWTGzYroCUR7Pdukr8ky+MouOE6Q9C7hpZ+ZM8JzlqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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