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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37f4c068ea2ae90902699f39732f998e190a9356d370643655059a7152886e21' 
  AND token = '1HfJO92WY9VRGgpX7mn+k3iBmvAYImRgz9AJyA6Q9Q8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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