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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ee3b8f5a4054e22251e631913f3738221e2ee2165f87ec771675fe1ce124932' 
  AND token = 'FEBZ8TL6KsV41yiVz8zpSS77NyZOQrCutOuhntKHt/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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