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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a30f168377e828a6b9112b61edd74a192bddd191a210ae16e9d68bfdfba5ad1' 
  AND token = 'uxh0z/WyjCRfG6dN9BW8avtzQj+Vc3TCMtKy5RDKfkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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