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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15119a79e2dcf350b0eb007fa54eeb9720189ef921b9eb7969bbcce9dc2bcb16' 
  AND token = 'UEPMuj17VwxPtZ2B/rARgpX1URKL3OkDi/SHd7HH5Bc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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