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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90c86ef8b6780b8d5bb0281ce0c36b46e3bd0be23ad622791a85939ec7a666da' 
  AND token = 'cJw1tx66KHw2zIj9xXH2xVgM2qaDXOXJe8as9XgzEvI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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