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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5af7644adb040f2a7cc21624b5a00f6f7654aecb1f2a9cb6cbbdcf85358a3b0' 
  AND token = '0EzLTfzuNxp2nZAEqcfLbc1pZc55gCok1J4iw50INJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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