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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d46666851cbf304b3ebba39d91fe6daff15bc6fccab4ecc3373386cf1c8f570' 
  AND token = 'xUyg7xqK5pguJtdpHUR7Ih4aOknqe8YdzxkyfOAOd9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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