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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c70dd648fb2c6f8c1e04ec546a5dcb39ac692c3e2fa222f357c09b5230575a6' 
  AND token = 'ZuLEY99Ues/t+Vyj1cONGgmQU0vx7caBH+CPdIQnL9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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