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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6526208f2399be9685fec543f4037e0dfd830a9cfe98f6f260a0c29a3547150' 
  AND token = '0xe30uiI/JBbMMdyD4/I/rX598GVLE/uNDTmF18KpLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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