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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a90869abc7bf9204c3ebc96f37e2021e07b81cc1f0e28f77f62611c2ccdcc3ef' 
  AND token = '+p67zAnUFMxVL6poR4ViHqf9ievyQxWM5raW3dQMvBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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