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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f44bf7509a7c32200186a0c1a706680b4c49d1a8fc92e3872d4ee9d8ec09238a' 
  AND token = 'KEF36NGJymws83ozL4raXcmZ8MU7X74xs9gyIp88QOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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