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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc80f9809e262ebe161dfea84f6a5f45e4534e10b7a639a4517c6abe17a5e168' 
  AND token = 'HG9AXv5T9QjiJk5IqRdhcufbVYur3SSW1nnLpzvlQN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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