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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3d9a3f9ea2bcf2a8a9237fb18554c8815a07bfb39389767660f767e869f58c9' 
  AND token = 'P0Yu2eATWY5lDyeer9gUoKDVWptwNwrS4uvnyiobaCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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