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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a08bea9a99902a61fcb30d6f5302defd7bad12883cd7e2dd00804f026a08dd1a' 
  AND token = 'xRrA3aGJ7AL8GLf3eZsl6cDRFopJRlqjTeYKjk6jWEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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