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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61b08cc0b17974f0116b0b35ba7e20f8bf52284970899776477960a4078fb389' 
  AND token = 'PzMhgoV7xOZxCJlYU1/FoP9TdR8VCMB9u1rcY40zvbs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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