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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df62f601ccc6a953be1b80ae6b0f52fbd2567ae08c97310f0ea6f7bfa9714faa' 
  AND token = 'h6yBcDNaR1wF5TLUvcLaQ6WvgjvJtWfz8Mch1ToI7eA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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