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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf0b2d9dfb75f260b6932256a7e70d60b71c88d3ece2ee2c5b3ca808b04e12a4' 
  AND token = 'oT15fQt0rAy69Pc53XunjNg/8eUUGxFoT84vZok4OGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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