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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f59bf5ae6ec4a2c0e5d2233306b6838a76b8b0fb5a3db839af50888f1eb354b' 
  AND token = 'pHJvoEGA2L4XRE8ukf+gNxM5LCBXHgV3cfmtJLyVheI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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