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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd1fe02ff1d75f859388ccf7e433f4461c58fa0d474688ec23003cfa8f3af822' 
  AND token = '6NAm9xQTj8FbMyIC9+DNukiCJThNuLnf+u0dKmQm7JA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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