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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a747b32897c3cb350e5b1f7651dd90f72545507fc55833a4a52fd09cb473bb54' 
  AND token = '+T+3kxmWUqauNQhQ0ur4Pl0FOqabvGX6+Fbzbfaje1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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