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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b68e5df6253db2662f516c91b6093b619b12d42400a71bbd230b5aced2bc36c' 
  AND token = 'IqxWfvHe8/7FYI2f6GV1wrsN2kekAvGxiYFoH7vyVPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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