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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32a64c96bd16fe6936c1b36e867aa73ec10fd032ee5eba06964d69a115d2b6ca' 
  AND token = 'BQ/PiETcKPsLPK9L9BzaXFzq73K0NkB5MjGtOdvsps4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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