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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c15e4349f397fc583c0144ef336e0fca5a8019209eb6ef0deda0d1600ea8a44' 
  AND token = 'sg2pRNuSXtwJVMqESdzK/xZ7Cvomeav0aCUq7f/5Bjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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