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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a908ba594a7157d6940a617386d2528b81adc75ecaf3bc94830daae59197219' 
  AND token = 'JuECKAE/X9d0HmGTvSq9tfqKkPi/Z7DK+lFAn+1CcKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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