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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9edb6bfc818d9a2e286748f06133166b476063d8975bb9d9d10f11d72e33b20b' 
  AND token = 'GbNLpcORzNo1kC5qNB4y+Uj1upJYdYdX8MK9bS/oyWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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