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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6ab8ca15aca6d061627ab9f212724560a0b8825859abc46c9e7d64be69afdbb' 
  AND token = 'aH2DNHZ5yoHZjeizVnZTOGyUymeMEdD9xnVa93qdJ3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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