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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ebcdb82f971549f8c58515e31b14e633dd278cf637d3c236efba44e3a3a6258' 
  AND token = '76Dvh07aOU7+AZVFibpN0SW4E1T4avpy2fLvBcp3UTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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