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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd9ff2700bd0eb3cafa269e18f0c7f5d328ab4dc77b56edd21ad729c49aaa50f' 
  AND token = 'kWMevsdw9NksHWHcnzfJuKP9XowEjSzUaNLDOsTlbQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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