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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b72a6fef79650e7b872ba28493624312faaa53627f1e75db59f20006c3b33999' 
  AND token = 'MQ/6amaOPZZiAGPpju4d1A0Qs7zYMP6szAH8sjx7kBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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