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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47c0c81de12aebb1613e042cb9af618b60d686bb5575835c6d1f6fd60c3e548e' 
  AND token = 'H+b1DMihjC5Qk9HK06JI53BatMcl92ip7yge6Mezz7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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