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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecb0232368add8e42cdb02ddb0f6eca8fe54981904ceb88f23d28325baff395b' 
  AND token = 'qgOv1IlGNBpvw94ai2f4mHaYzv6MV9oa++mGttnMd4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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