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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71baa92cb38a9d7e5c60172653d6b7ffd32848d8aa4d30964660ecf3906c4cfc' 
  AND token = '+plNkJp67NnF8AKySxNkjRYR/Plr8+vg7kRmxAzD2Sc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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