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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cd66a7bcb38e93b4a1404ef34b10fba9be3488cd003918eaef16c90cb21bc91' 
  AND token = 'K1BWmHWSY1NUw5f7+cmcqNJrPpdlEhM1f4fvMzaerJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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