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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f271de4d529ea1b90751bfbbcae4a602c3426307e22ac2f3a2f4021cbd391d4' 
  AND token = 'lU9zsLqtZFXPe6YSStxGp7Gi1rHpRYByp9JkY4ZqtGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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