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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee95f694c3d065ab881a3a524e3f48625358b55833339fc7dae50c4e533cd5bc' 
  AND token = 'Zjdn2/Bpq5XAO/4+d2N7LHdXBg4TIoHvGIEHS1Ie2rg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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