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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3098337916a19dd9d08f4aa02ce6fef8c0fdf230d43bbe627742d6e0be0f847' 
  AND token = 's6oh/q1PnHAztltIBIBHq8oUw9jL8SREonYiqM00tG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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