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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99c41571110195be9f8464f0ecd0546824ed42de1427cc5c1805b9975c87f5dd' 
  AND token = '9Wqt9JAGRTrZvxDIPPWf/OO7DCMaapK97pGNP2rILH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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