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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7579e314ce5eb27152a8ce4f7e4c9ed5cbd39b60745c771bdbc0b83833c30ff' 
  AND token = 'qRDa2DRBvjAmD/SwXPxRy7labr6lPSPwbjnw62ehWZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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