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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1be00f40e3b8556ad2046d2f4b7d684d9db5d1d45a9de75341e159f0ae335b00' 
  AND token = 'Inq/OwF3dJpafcBHo0sI3PyqvCgMevA2WZkz+BikeEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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