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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dbaaff1c5544b365a6bbe7c0bdbf356a26369bee5b195bf353174075ff9d0fb' 
  AND token = '9Z5Io5oBu3EcLNs0bAme1hAKCsTYwO0gOu9kOp97+3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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