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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f351f5157ebf7d7c99b51b65a5f71711474ee9bf092c3874163118c8bfe1559' 
  AND token = 'epnNRKS74G3jkzcDxwrGdDPztYYK0Omv+SXFWYRiPpo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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