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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afa40a23605cafa3c2b13ac9817c0815e5e8adf3bf93c3b275c0ee292c48d9f8' 
  AND token = '7oEAXpm+Y1ExDZKNqkevck94XpMSXDXBfwx6J9/SfBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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