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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bae59634fc6c73127fb27fa74c64e00c008ae02473b63c4bc08f3c727d1bb57' 
  AND token = 'rQkwv73T184oTpBWkRTZgKDjgpoF7XO2GgFWrzafdBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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