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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f65a13afead192619938b6a6326aa246aedb7874673ab2d156f418150be9061' 
  AND token = 'tjJEvwi4a0aLjTQkKcMGQjmrfcxfC2nXozhJXt/fAxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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