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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1ddf4496389e76016380521a7c723ed6d268d5f13b0440a3eb4b5eeca5fa280' 
  AND token = 'GZ2rCxMo8FAsbVElPHVS72AC/jIGa7g/kuAYqdHA6Y0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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