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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bcde9825547898764f782a2d6b99496c472039c772afa772a6f1f2679b7e364' 
  AND token = 'EFqfvJxL+baB4V/eilGd5so6QS+jb6xTMeYl9xZNllA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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