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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cb252bcfb58ea92bcde7d1f09067752de68f1bec24a41475f8611d677fcbfb0' 
  AND token = '3P0viWexQ9XAs5VBv9TfrnOZ2tfKVVbE1L3MhlPx370=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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