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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2029594c6c557ebb58d93b1fcfe14c88a28e8860f9695be009d9ec25cdca1163' 
  AND token = 'Fb/W0ygexNKKIu+yN94QtodmEPJIJNg3Y6N1LdIrG44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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