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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f63253388d888ef620f278ec042b340393c9023cb7d6b0fcf1b3fa0ff346c04e' 
  AND token = 'ZYAuDzRxEtofQ/9Vgrkera270q4TvDkqmHUwypo88l8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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