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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6302d76246203b6b1a2d999b983137f7f8474ac971ac78bf4cbf57ef774c7315' 
  AND token = 'Glptc1ZycHAv7rDN6JkNktXKCk8hkuwwkZo+STfzbQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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