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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee862afae61882211a2cf054e95cf59f5c3b6d0126e30eff4b39450fef8229bd' 
  AND token = 'u1d2wvExwq/fee5H10HHemjcUAMaMDbt/33t8/TvMyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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