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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d40990229fa5e75a0b7aff63500753e2d1b84e1a92798b81858a89ca71c5901' 
  AND token = 'hiQsmT2k4bbp2iuWxz1czxVdx4SIgh9ghObdGhNUTc0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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